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Compounded peptides from FDA-registered 503B facilities meet USP monograph standards, while unregulated suppliers may offer lower-purity peptides with undisclosed impurities
But age creates a problem
Avoid suppliers who fail to publish lot-specific COAs, offer generic 'batch' certificates, or mask analytical raw data
This window corresponds with the initial dose escalation phase and the period of most rapid metabolic adjustment
Glutathione can trigger detoxification symptoms such as headaches, nausea, and fatigue
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